<template>
  <div class="tags" v-if="showTags">
    <ul>
      <li
        class="tags-li"
        v-for="(item, index) in sliderBar"
        :class="{ active: isActive(item.path) }"
        :key="index"
      >
        <transition name="move" mode="out-in">
          <keep-alive :include="keepAlive">
            <router-view></router-view>
          </keep-alive>
          <!-- <router-view ></router-view> -->
        </transition>
        <!-- <router-link :to="item.path" class="tags-li-title">
                    {{item.title}}
                </router-link> -->
        <span class="tags-li-icon" @click="closeTags(index)"
          ><i class="el-icon-close"></i
        ></span>
      </li>
    </ul>
    <!-- <div class="tags-close-box">
            <el-dropdown @command="handleTags">
                <el-button size="mini" type="primary">
                    标签选项<i class="el-icon-arrow-down el-icon--right"></i>
                </el-button>
                <el-dropdown-menu size="small" slot="dropdown">
                    <el-dropdown-item command="other">关闭其他</el-dropdown-item>
                    <el-dropdown-item command="all">关闭所有</el-dropdown-item>
                </el-dropdown-menu>
            </el-dropdown>
        </div> -->
  </div>
</template>

<script>
export default {
  data() {
    return {}
  },
  methods: {
    isActive(path) {
      return path === this.$route.fullPath
    },
    // 关闭单个标签
    closeTags(index) {
      const delItem = this.sliderBar.splice(index, 1)[0]
      const item = this.sliderBar[index]
        ? this.sliderBar[index]
        : this.sliderBar[index - 1]
      if (item) {
        delItem.path === this.$route.fullPath && this.$router.push(item.path)
      } else {
        this.$router.push('/')
      }
    },

    // 设置标签
    setTags(route) {
      const isExist = this.sliderBar.some((item) => {
        return item.url === route.fullPath
      })
      if (!isExist) {
        if (this.sliderBar.length >= 8) {
          this.sliderBar.shift()
        }
        this.sliderBar.push({
          title: route.meta.title,
          path: route.fullPath,
          name: route.matched[1].components.default.name,
        })
      }
      bus.$emit('tags', this.sliderBar)
    },
  },
  computed: {
    showTags() {
      return this.sliderBar.length > 0
    },
    sliderBar() {
      return this.$store.getters.getSliderBar
    },
    keepAlive() {
      return this.$store.getters.keepAlive
    },
  },
  watch: {
    $route(newValue, oldValue) {
      this.setTags(newValue)
    },
  },
  created() {
    this.setTags(this.$route)
    // 监听关闭当前页面的标签页
    bus.$on('close_current_tags', () => {
      for (let i = 0, len = this.sliderBar.length; i < len; i++) {
        const item = this.sliderBar[i]
        if (item.path === this.$route.fullPath) {
          if (i < len - 1) {
            this.$router.push(this.sliderBar[i + 1].path)
          } else if (i > 0) {
            this.$router.push(this.sliderBar[i - 1].path)
          } else {
            this.$router.push('/')
          }
          this.sliderBar.splice(i, 1)
          break
        }
      }
    })
  },
}
</script>

<style>
.tags {
  position: relative;
  height: 30px;
  overflow: hidden;
  background: #fff;
  padding-right: 120px;
  box-shadow: 0 5px 10px #ddd;
}

.tags ul {
  box-sizing: border-box;
  width: 100%;
  height: 100%;
}

.tags-li {
  float: left;
  margin: 3px 5px 2px 3px;
  border-radius: 3px;
  font-size: 12px;
  overflow: hidden;
  cursor: pointer;
  height: 23px;
  line-height: 23px;
  border: 1px solid #e9eaec;
  background: #fff;
  padding: 0 5px 0 12px;
  vertical-align: middle;
  color: #666;
  -webkit-transition: all 0.3s ease-in;
  -moz-transition: all 0.3s ease-in;
  transition: all 0.3s ease-in;
}

.tags-li:not(.active):hover {
  background: #f8f8f8;
}

.tags-li.active {
  color: #fff;
}

.tags-li-title {
  float: left;
  max-width: 80px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  margin-right: 5px;
  color: #666;
}

.tags-li.active .tags-li-title {
  color: #fff;
}

.tags-close-box {
  position: absolute;
  right: 0;
  top: 0;
  box-sizing: border-box;
  padding-top: 1px;
  text-align: center;
  width: 110px;
  height: 30px;
  background: #fff;
  box-shadow: -3px 0 15px 3px rgba(0, 0, 0, 0.1);
  z-index: 10;
}
</style>
